1 . Scientists have sent more and more astronauts into space ________ the first man stood on the moon.

A．while

B．after

C．when

D．since

2 . Jenny and Jane were talking in the kitchen ________ I was reading the newspaper.

A．while

B．before

C．after

D．when

3 . —Do you know about Wenzhou well?
—Sure. ________ I was a child, I have lived here.

A．Because

B．Since

C．While

D．And

4 . Yesterday I was just to go out ________ someone called me.

A．when

B．while

C．as

D．that

5 . Please call me ________ your sister comes back.

A．while

B．as soon as

C．until

D．because

6 . My father did not come back ________ 11 o’clock yesterday evening.

A．while

B．as soon as

C．until

D．because

7 . It gets cold at night. ________ you don’t wear your coat, you’ll catch a cold.

A．If

B．How

C．While

D．Unless

8 . — When shall we go planting trees in the hill?—________ it begins to rain, so they don’t need watering.

A．Unless

B．While

C．Till

D．Not until

9 . Mum says ________ I do my homework now, I can watch a movie tonight.

A．while

B．before

C．if

D．until

10 . We will go for a picnic ________ it is sunny tomorrow.

A．when

B．whether

C．if

D．while